In this paper, it is intended to analyze the influence of coarse grain (CG) phase on mechanical properties and wear performance of Al–2Cu-4 wt% B₄C trimodal composite. Trimodal ultra-fine grained (UFG) composites with 30 and 50 wt% aluminum coarse grains (4-66-30) and (4-46-50) were prepared using powder metallurgy and hot extrusion. Wear tests were conducted for normal loads of 20 and 50 N at a sliding velocity of 0.6 m/s at room temperature. Results revealed that there was a direct relationship between the CG content and the plastic deformation of worn subsurface. Moreover, by adding 50 wt% CG, wear rate reached to around 0.02 × 10⁻³ (mm³/m) and plastic deformation increased significantly. Investigations on the microstructure indicated that wear mechanisms of the trimodal samples were a combination of abrasive, adhesive, and delamination wear in the tribological layer.

本文旨在分析粗晶粒（CG）相对Al-2Cu-4 wt％B ₄ C三峰复合材料的力学性能和磨损性能的影响。使用粉末冶金和热挤压制备具有30和50 wt％的铝粗晶粒（4-66-30）和（4-46-50）的三峰超细颗粒（UFG）复合材料。在室温下以0.6 m / s的滑动速度对20和50 N的正常载荷进行磨损测试。结果表明，CG含量与磨损的地下塑性变形之间存在直接关系。此外，通过添加50 wt％的CG，磨损率达到约0.02×10 ^-3（mm ³/ m），塑性变形显着增加。对微观结构的研究表明，三峰样品的磨损机理是摩擦层中磨料，粘合剂和分层磨损的组合。